Year | Value | 2022 | 7.653 | 2021 | 7.771 | 2020 | 7.889 | 2019 | 8.009 | 2018 | 8.13 | 2017 | 8.251 | 2016 | 8.373 | 2015 | 8.497 | 2014 | 8.623 | 2013 | 8.751 | 2012 | 8.879 | 2011 | 9.01 | 2010 | 9.151 | 2009 | 9.309 | 2008 | 9.47 | 2007 | 9.634 | 2006 | 9.8 | 2005 | 9.969 | 2004 | 10.14 | 2003 | 10.314 | 2002 | 10.49 | 2001 | 10.671 | 2000 | 10.858 | 1999 | 11.048 | 1998 | 11.241 | 1997 | 11.436 | 1996 | 11.634 | 1995 | 11.836 | 1994 | 12.04 | 1993 | 12.248 | 1992 | 12.458 | 1991 | 12.672 | 1990 | 13.016 | 1989 | 13.387 | 1988 | 13.767 | 1987 | 14.157 | 1986 | 14.555 | 1985 | 14.962 | 1984 | 15.379 | 1983 | 15.806 | 1982 | 16.241 | 1981 | 16.687 | 1980 | 17.113 | 1979 | 17.484 | 1978 | 17.861 | 1977 | 18.245 | 1976 | 18.634 | 1975 | 19.031 | 1974 | 19.433 | 1973 | 19.842 | 1972 | 20.257 | 1971 | 20.679 | 1970 | 21.12 | 1969 | 21.606 | 1968 | 22.099 | 1967 | 22.602 | 1966 | 23.112 | 1965 | 23.631 | 1964 | 24.156 | 1963 | 24.691 | 1962 | 25.233 | 1961 | 25.783 | 1960 | 26.389 |
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